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We propose an approach to realize a hybrid quantum system composed of adiamond nitrogen-vacancy (NV) center spin coupled to a magnon mode of thelow-damping, low-moment organic ferrimagnet vanadium tetracyanoethylene. Wederive an analytical expression for the spin-magnon cooperativity as a functionof NV position under a micron-scale perpendicularly magnetized disk, and showthat, surprisingly, the cooperativity will be higher using this magneticmaterial than in more conventional materials with larger magnetic moments, dueto in part to the reduced demagnetization field. For reasonable experimentalparameters, we predict that the spin-magnon-mode coupling strength is $g\sim10$ kHz. For isotopically pure $^{12}$C diamond we predict strong coupling ofan NV spin to the unoccupied magnon mode, with cooperativity $\mathcal C=6$ fora wide range of NV spin locations within the diamond, well within the spatialprecision of NV center implantation. Thus our proposal describes a practicalpathway for single-spin-state-to-single-magnon-occupancy transduction and forentangling NV centers over micron length scales.

Predicted strong coupling of solid-state spins via a single magnon mode